Oil-burner-controlling device



Aug. 3 1926. 4 1,595,013

- L. LITHMAN OIL BURNER CONTROLLING DEVICE Filed June 19, 1925 Patented Au. 3, 1926.

UNITED STATES LEOPOLD LITHMAN, OF WORCESTER, MASSACHUSETTS.

OILBURNERCONTROLLING DEVICE.

Application filed June-19,1925. Serial n 38,384.

This invention relates to apparatus for burning liquid fuel and the principal objects thereof are to provide liquid fuel burner having means for operating it by an air current with automatic means for shutting off both the oil and the gas for the pilot light whenever the current of air is interrupted or materially reduced, thus avoiding the dangers due to the fact that these currents might flow when the blower not working. The invention also involves improvements in the details of construction which these results are secured as l pea-r.

Reference is to be had to the accompanying drawings, in which Fig. 1 is a plan, partly in section on the line l1 of Fig. 2, of a controlling device and burner constructed in accordance with this invention;

Fig. 2 is an end View of the same partly in central section showing the parts in the position they assume when in operation;

Fig. 3 is a side view showing the gas and oil shut off; and v Fig. 4 is a sectional view on the line 44 of Fig. 2 enlarged.

I have shown the controlling device as mounted on a base 10 which supports a pipe 11 connected with the blower and constituting the air line. The current of air is delivered through this pipe around at the top of the device into the casing 12 of the burner itself.

On the base 10 is supported a pipe 13 open at the top and closed at the bottom and connected by a by-pass 14 with the air line 11 so as to let air into this pipe 13 and into a casing 15 which has a rubber diaphragm 16 across it. This is a piece of solid rubber which may be a quarter of an inch thick so that it will be strong and durable under the conditions under which it works. It moves back and forth only a short distance and is not subjected to any severe action but while the blower is operating the under side will be elevated as shown in Fig. 2. Under normal conditions, it will drop back to the horizontal position shown in Fig. 3.

Upon the diaphragm rests a head 18 of a vertical plunger 19. This plunger passes through a passage in the top of the casing 15 and is adapted to rise and fall with the diaphragm on which it rests. It acts against the resistance of a spring 20 under a bracket 21 which is adjustably fixed on a vertical support 22 carried also on the outside of the casing 15. The plunger has an adjustable collar 39 by which it is loosely connected with two incependentarms 23 and 24 so that they will rise and fall with it. Each of these arms is mounted on the stem of a valve and the turning of these arms by the rise and fall of the plunger 19 opens and closes these valves. One of the valves 25 controls the flow of liquid fuel to the burner and the other valve 26 controls the flow of gas from a main 2'? to a pilot burner 28. The pilot burner has a by-pass 40 to allow a small amount of gas to flow when the main burner is shut off and avoid necessity of manually relighting it.

These valves are held in position by straps 29 each resting on one of the valve casings at one end and on a projection 30 on the casing 15 at the other end and held down by a screw 31 to keep the valve casings in position and yet allow them to be removed for cleaning and repairs.

The valve 25 which controls the supply of oil is provided with an outlet pipe 33 connected with a burner nozzle or tube 34. This is located in the casing 12 which may be provided with one, two or three burners as desired, only one being shown in the drawings. Any desirable kind of burner can be used and as the construction of the burner is not a feature of this invention I am not describing it in detail but a burner can be used like the ones shown in my copending application filed August 19, 1924, Serial No. 732,977. It is so arranged that the air coming through the pipe 11 into the casing 12 regulates the flow of oil through the burner nozzle in proportion to the air The casing is closed by a front plate 35 which has one or more perforations located in alignment with the nozzles 34 through which the liquid fuel is forced out, in a spray 36 mixed with the air, into the space in which it is to be burned and over the frame of the pilot light 28.

This constitutes a simple and convenient method of regulating the flow of liquid fuel and providing the means above mentioned. Obviously the reduction in the flow of air to the burner caused by the failure of the blower to operate, or by shutting it off intentionally, will automatically let down the plunger 19. This closes both the valves 25 and 26, thus preventing the waste of fuel and gas and reduces the danger ofexplosion. The operation of the diaphragm on the valve arms 23 and 24L can be regulated by adjusting the arm 21 up and down the stud The valve casings 25Vand 26can be removed very easily for inspection and repairs or replacement without interfering with any of the other mechanism or with the adjustments already made.

Although I have illustrated and described only a single form of the invention I am aware of the fact that modifications can be made the; ein by any person skilled in the art without departing from the scope of the invention as expressed in the claims.

Therefore I do not wish to be limited to all the details of construction herein shown and described, but what I do claim, is

1. ihe combination with a liquid fuel burner and means for conducting air under pressure to therlourner for mixing with the fuel, of a casing connected with the air supply system having a diaphragm across it, a plunger resting on the diaphragm, a collar on the plunger, a pair of arms pivoted on opposite sides of the plunger and connected with the collar, a valve controlled by each of said arms, one of said valves arranged to control the supply of liquid fuel to the burner, a gas pilot burner controlled by the other said valve and a spring on the plunger for exerting pressure on the two arms to hold the valves normally closed.

2. In a liquid fuelburning device, the combination with a liquid fuel burner, 21. gas pilot light therefor, and valves for supplying the fuel thereto each having an arm for operating it, of means for conducting a supply of air under pressure to the burner in position to be discharged with the current of liquid fuel, a casing connected with the air supply and having a solid thick rubber diaphragm across the same, a plunger resting on said diaphragm, said arms for operating the valves being connected with said plunger to be operated thereby, a spring exerting pressure on said arms to hold them and the plunger down, and means for regulating the pressure of the spring, whereby when the air supply fails the spring will force the. arms down and closethe valves.

in testimony whereof I have hereunto afiixed my signature.

LEOPOLD LITHMAX. 

